Connecting an aftermarket stereo to your car can seem daunting, especially when dealing with wiring harnesses and interfaces. This guide provides a detailed walkthrough of connecting a PAC RP4.2-TY11 wiring interface to install an Alpine iLX-W650 head unit in a 2008 Toyota FJ Cruiser, focusing on the crucial connection to the vehicle’s wiring system. This process, while not directly involving the OBD2 port, is essential for retaining factory features like steering wheel controls and the factory subwoofer.
Preparing for Installation
Before diving into the wiring, gather the necessary components: an Alpine iLX-W650 head unit, a PAC RP4.2-TY11 wiring interface, a Metra 95-8202 dash kit, and a MicroBypass for bypassing the parking brake safety feature. Removing the factory radio is the first step. This involves carefully detaching the trim and unscrewing the existing unit.
Modifying the factory metal radio mounts may be required for proper fitment of the new head unit. Minor adjustments, like drilling out obstructing metal bumps, ensure a flush installation with the dash kit.
Wiring the PAC Interface
The core of the installation lies in connecting the PAC RP4.2-TY11 wiring interface. Begin by connecting the primary power wires: black (ground), yellow (constant 12V), and red (accessory 12V) from the Alpine harness to the corresponding wires on the PAC interface.
Next, connect the speaker wires, ensuring correct polarity: green(+) and green/black(-) for rear left, white(+) and white/black(-) for front left, gray(+) and gray/black(-) for front right, and violet(+) and violet/black(-) for rear right.
If using a MicroBypass, integrate it into the wiring by connecting its yellow/blue and blue/white wires to the corresponding wires on the Alpine harness and reconnecting the ground wire.
Connecting to the Vehicle
The PAC RP4.2-TY11 harness includes multiple vehicle connector plugs. For a 2008 FJ Cruiser, only plugs 3, 4, and 5 are necessary. Connect these plugs to the corresponding connectors in the vehicle’s wiring harness.
Connect the assembled harness to the interface unit, selecting the “Non-amplified Audio Output” as the 2008 FJ Cruiser lacks a factory amplifier. Finally, configure the programming pins on the interface unit according to the Alpine head unit’s requirements (pin 1 ON, all others OFF).
This meticulous wiring process ensures that the aftermarket head unit integrates seamlessly with the FJ Cruiser’s existing electrical system, preserving functionality and delivering a superior audio experience.
